Stropping-machine.



F. H. HOFFMANN.

STROPPING MACHINE. I APPLICATION FILED MAR-l3. 191a.

Patented Jan. 30, 1917.

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D @TAEE Q FREDERIClK 'H. HOFFMANN, 0F JERSEY CITY, NEW JERSEY.

STBOIPPINGr-MACHINE.

Specification of Letters Eatent.

rammed Jan. so, iota.

Application riled March 13, 1913. Serial Ito. 753,904.

of thin material and 1 quently more or less diiiicult to satisfactorily strop or sharpen without the employment of some specific means for properly guiding the blade on the strop 1n the reciprocatory movement which is necessary in the stropping process.

The object of the present invention is to provide a stropping machine which will be extremely durable and which will at the same time be simple in construction, so that it may be economically produced.

A further object of my invention is the production of a stropping machine for razor blades wherein but few movable parts are employed, the arrangement of those parts being such that they will cotiperate in a manner which will insure positive and clllcient operation of the device.

My invention further contemplates a razor blade stropping machine in which the mechanism employed for reciprocating the blade holder is in part formed integral with the frame of the device, so that the possibility of displacement of the parts and the consequent necessity for adjustments are reduced to a minimum.

I shall now proceed to describe my invention with reference to the accompany- Q jing drawings and then point out with more particularity the elements of novelty therein in the appended claims.

In the drawings: Figure l is a plan view from the bottom of my improved razor stropping machine; Fig. 2 is a longitudinal sectional view of my device taken on the line A-A of Fig. 1; Fig. 3 is a transverse view of the front end ofthe frame; and

which it is cause;

Fig. 4 is a similar view of the opposite side ofthe portion of the frame shown in Fig. 3.

Referring now to the drawings in detail in which like characters of reference are employed to designate similar parts throughout the several views, I provide frame preferably of rectangular configuration, comprising a front plate 7 and a rear plate 8 which are connected by the parallel rods 9 and 10 as shown in Fig. 1. Each of said plates 7 and 8 is provided with a centrally located elongated slot llthrough which the rod 12, carrying the blade holder 13 as shown, extends, the end of said rod contiguous to the rear plate 8 of the frame being threaded or otherwise adapted to have rigidly secured thereto the handle 14. Each of the said plates 7 and 8 has a rack 15 and 16 formed integral therewith and preferably at the top portion thereof (see Fig. l), the teeth of each of said racks being arranged to mesh with the pinions l7 and 18 respectively which are rigidly secured to the ends of the blade carrier 13 rotatably mounted on the rod 12, so that the reciprocation of the rod will simultaneously rotate or rock said carrier 13 in the manner and for the purposes which will herein-- shoulder 20 which is similarly secured to said rod and likewise rides upon the outer surface of the other plate 8.

Mounted on the outer surface of the plate 7 adjacent to each end thereof, are the lugs or projections 21 in which is rigidly mounted a rod 22, said rod passing through an aperture 23 in the boss 24 formed on the reciprocating plate 20, said boss 24 being normally capable of unrestricted longitudinal movement on said rod 22. Mounted on the rod 22 are a pair of coil springs, the 100 .mbefore described ture may be var ed in one spring 25 hearing reone of the projections 21 and the boss 24, the other spring 26 being similarly arranged with respect to the other projection 21 and the opposite side of said boss 24. These springs under normal conditions serve to maintain the blade carrier 13 in its central inoperative position, as shown in Figs. 1, 2 and 3.

It will be obvious from the structure herethat in th opposite ends of spectively against e cmpiwyment of; my invention the strop 2? is passed through the frame over each of the rods 9 and 10 and under the blade-carrier rod 12. The blade holder 13 is'rotatably mounted on this latter with two jaws of resilient material as shown bfitween which the razor blade is inserted, t

stropping operation, as is well known, the stropping machine is moved vto and fro or reciprocated on the strop 27 by means of the his movement the bladethe machine, movement of the handle in one direction rocking the carrier 13 until the rod 12 abuts one end of each of the elongated slots 11, which serves to bring one edge of the blade 28 in the carrier 13- into effective engagement with the contiguous surface of the strop, (see Fig. 4) the continued movement of the stropping machine in the same direction eii'ecting the stropping of that edge of the blade. The movement of the machine in the reverse direction will similarly bring the opposite edge of the blade into engagement with the stropping surface. It will be observed that in the reciprocation of the machine on the strop 27, the coil springs 25 and 26 will bealternately contracted, the ex- While I have described my invention with regard to the specific details of structure erein shown, it is obviousathat the strucminor details with-, out departing from the spirit and scope ofv my invention as set forth and claimed herein.

Having thus described my invention, what claim as new herein and desire to secure by Letters Patent is:

A stropping machine for razor blades comprising a frame formed with a air of oppositely positioned elongated s ots, a la e carrier movably mounted within said k formed integral with each end and adjacent to each of said a pair of pinionsimounted rod and is preferably formed tioned within on said blade carrier and in mes on said 1 taiaoea blade carrier in mesh with said racks, means for reciprocating said blade carrier, whereby said racks and said pinions will coiperate to impart a rocking motion to said blade carrier a rod mounted exteriorly of said frame and means freely movable thereon and adapted to alternately engage and co .rier in the stropping operation.

comprising a frame formed with a pair of elongated slots, is mounted within said oppositely positioned lade carrier slots,

end of said blade carrier, said springs bein adapted to assistthe movement of said blade y Y 3. A stroppmg machine for radar blades,

air of comprising a frame formed with oppositely positioned blade carrier movably slots, a rack formed frame adjacent to each mounted on said blade carrier and in mesh with each of said racks,:a rod positioned transversely of said tram d a pair of spiral springs loosely mounted on said rod and adapted, to contact'with a portion of said blade carrier to normally maintain said blade carrier in the blade inserting position, and means for reciprocating said blade carrier to oscillate the same, sitely disposed spiral springs be nately compressed upon the reciprocation of said blade carryingmember, the inactive spring being out of contact with said blade carrier when its opposite is compressed, whereby the expansion of the compressed spring will serve to assist in the reciprocatory movement of said blade carrier.

stropping machine for razor blades, comprising a frame formed with a pair of a elongated s ots, a mounted within said integral wi b said of, said slots,- pinions of said irame members having opposite].

disposed ears'formed thereon, a rod posisaid ears, a blade carrier movably mounted within said slots, a rack formed integral with said frame adjacent to each of said slots, pinions rigidlymbunted of said racks, and a pair of spiral springs mounted on said rod and in enga ement with said ears and a portion of sai blade canengage with one its oppositely positioned elongated slots, one

rier, and means for reeiprocating said blade carrier, whereby said springs W111 be alternately compressed, the expansion of the compressed spring serving to return the blade carrier to its normal blade inserting position.

In witness whereof I have hereuntoset I ny hand in the presence of two subscribing vgizfxes ses. FREDERICK H. HOFFMAN N.

Witnesses:

EDNA LEFFLER,

R, E. HOFFMANN. 

